School of Environmental Science, Liaoning University, Shenyang 110036, China E-mail:
School of Environmental Science, Liaoning University, Shenyang 110036, China.
Water Sci Technol. 2023 Nov;88(10):2633-2645. doi: 10.2166/wst.2023.353.
The effect of carboxyl and hydroxyl groups attached to the benzene ring on the photodegradation of anthracene (Ant) and pyrene (Pyr) in ice was investigated. The present study aims to explore the inhibition mechanism of five dissolved organic matter (DOM) model compounds' materials such as benzoic acid, o-hydroxybenzoic acid, m-hydroxybenzoic acid, p-hydroxybenzoic acid, and 3-phenyl propionic acid on the degradation of Ant and Pyr in ice. The photodegradation rate of Ant and Pyr were 50.33 and 37.44% in ice, with the photodegradation rate of Ant being greater than that of Pyr. The five DOM model compounds inhibited the photolysis of Ant and Pyr, and the influence mechanism on the photodegradation of Ant and Pyr depended upon the types and positions of functional groups on the benzene. Among them, the structure in which the carboxyl group was directly connected to the benzene ring and carboxyl was located at the ortho position of a hydroxy group had a strong inhibitory effect on the photodegradation of Ant and Pyr. Light-screening effects and quenching effects were the main inhibiting mechanism, and the binding ability of DOM model compounds material and PAHs is dominantly correlated with its inhibiting effect.
研究了苯环上的羧基和羟基对冰中蒽（Ant）和芘（Pyr）光降解的影响。本研究旨在探讨五种溶解有机质（DOM）模型化合物材料（如苯甲酸、邻羟基苯甲酸、间羟基苯甲酸、对羟基苯甲酸和 3-苯基丙酸）对冰中 Ant 和 Pyr 降解的抑制机制。Ant 和 Pyr 在冰中的光降解率分别为 50.33%和 37.44%，Ant 的光降解率大于 Pyr。五种 DOM 模型化合物抑制了 Ant 和 Pyr 的光解，对 Ant 和 Pyr 光降解的影响机制取决于苯环上功能团的类型和位置。其中，羧基直接连接到苯环上且羧基位于羟基的邻位的结构对 Ant 和 Pyr 的光降解具有很强的抑制作用。光屏蔽效应和猝灭效应是主要的抑制机制，DOM 模型化合物材料与 PAHs 的结合能力与其抑制效果密切相关。
